Thank you for bringing your concern to the Community. Let me guide you to the appropriate support channel to ensure your concern is addressed effectively, Erik.

While this forum is a valuable resource for troubleshooting common issues and gaining general QuickBooks insights, specific inquiries regarding with Sandbox categories to add product categories are best handled by our dedicated Intuit Developer support team. I recommend posting your question on their platform.

Here's how:

1. Visit the Intuit Developer Support website.
2. Click on the General Questions tile or select the product you need help with.
3. Select the Ask a Question button.
4. Sign in to your Intuit account.
5. Type in your concern, then click Ask.

Feel free to reach out again if you have additional questions or need further assistance.